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1、EmissivityCoefficientsofsomecommonMaterialsTheradiationheattransferemissivitycoefficientofsomecommonmaterialsasaluminum,brass,glassandmanymoreTheemissivitycoefficient-ε-indicatestheradiationofheatfroma'greybody'accordingtheStefan-BoltzmannLaw,comparedwiththerad
2、iationofheatfromaideal'blackbody'withtheemissivitycoefficientε=1.Theemissivitycoefficient-ε-forsomecommonmaterialscanbefoundinthetablebelow.Notethattheemissivitycoefficientsforsomeproductsvarieswiththetemperature.Asaguidelinetheemmisivitiesbelowarebasedontemper
3、ature300K.SurfaceMaterialEmissivityCoefficient-ε-Alloy24STPolished0.09Alumina,Flamesprayed0.8AluminumCommercialsheet0.09AluminumFoil0.04AluminumCommercialSheet0.09AluminumHeavilyOxidized0.2-0.31AluminumHighlyPolished0.039-0.057AluminumAnodized0.77AluminumRough0
4、.07Aluminumpaint 0.27-0.67Antimony,polished0.28-0.31Asbestosboard 0.96Asbestospaper0.93-0.945Asphalt0.93Basalt0.72Beryllium0.18Beryllium,Anodized0.9Bismuth,bright0.34BlackBodyMatt1.00Blacklacqueroniron0.875BlackParsonOptical0.95BlackSiliconePaint0.93BlackEpoxyP
5、aint0.89BlackEnamelPaint0.80BrassDullPlate0.22BrassRolledPlateNaturalSurface0.06BrassPolished0.03BrassOxidized600oC0.6Brick,redrough0.93Brick,fireclay0.75Cadmium0.02Carbon,notoxidized0.81Carbonfilament0.77Carbonpressedfilledsurface0.98CastIron,newlyturned0.44Ca
6、stIron,turnedandheated0.60-0.70Chromiumpolished0.058Concrete0.85Concrete,rough0.94Concretetiles0.63CottonCloth0.77Copperelectroplated0.03Copperheatedandcoveredwiththickoxidelayer0.78CopperPolished0.023-0.052CopperNickelAlloy,polished0.059Glasssmooth0.92-0.94Gla
7、ss,pyrex0.85-0.95Goldnotpolished0.47Goldpolished0.025Granite0.45Gypsum0.85Icesmooth0.966Icerough0.985InconelXOxidized0.71Ironpolished0.14-0.38Iron,platerustedred0.61Iron,darkgraysurface0.31Iron,roughingot0.87-0.95Lampblackpaint0.96Leadpureunoxidized0.057-0.075L
8、eadOxidized0.43Limewash0.91MagnesiumOxide0.20-0.55MagnesiumPolished0.07-0.13MarbleWhite0.95MasonryPlastered0.93Mercuryliquid0.1MildSteel0.20-0.32Molybdenumpolished0.05-0.18N
